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Answers

It depends, for some foods it could take months to figure out what is affecting you, and you may never figure it out. As far as hours/minutes after eating, my thyroid will react that soon to certain foods. Dave Asprey has an app where you can take a picture of yourself after you eat something, and it can tell you if you have a sensitivity (I've never used it).

For most food/issues, this is a general guideline: "at the end of the 3 weeks of elimination, reintroduce a single food for a single day only. And then monitor your symptoms for two days. For example, you might decide to reintroduce dairy on a Monday. That day you could eat some cheese, ice cream, and drink a glass of milk. While getting right back to your elimination diet, monitor for any abnormal reactions on Tuesday and Wednesday.

If you have no observable symptoms, you may try reintroducing another food (i.e. eggs) on Thursday. You can continue this process for a couple more weeks, reintroducing one new food every few days, until you’ve determined what foods may cause you an issue (if any).

The whole process will take approximately 5-6 weeks and, at the end of the experiment, you’ll know a heck of a lot about how your body responds to different foods."

http://squeezedonline.com/nutrition_info.aspx. Calories don't equate to how much carbs/sugar you are getting. I suppose it matters exactly which juice you consumed, but even at a 1000 calories you must have been drinking 10-15 servings a day of that stuff if that was all you consumed. These juices seem to range from 15-30 grams of sugar per serving (and that is the detox not the "sweetened" variety). You could have been getting as many 450 g of sugars from that diet and tons of carbs regardless. If anything, I would think that diet would make switching to Paleo harder, not easier re: sugar cravings.